E. coli

annual geometric mean not to exceed 610/100 ml

secondary contact recreation subzones; fish culture subzones

Dissolved Oxygen within 2 m of bottom

not less than 2 mg/L for 90% samples

marine waters;

fish culture subzones

Depth averaged Dissolved Oxygen

not less than 4 mg/L for 90% samples

not less than 5 mg/L for 90% samples

not less than 4mg/L at any point within the water column

marine waters; inland waters

fish culture subzones

inland waters

pH value

within the range 6.5 to 8.5; change due to waste discharge not to extend by 0.2

marine waters except bathing beach subzones

Salinity

change due to waste discharge not to exceed 10% of natural ambient level

whole zone

Temperature

change due to waste discharge not to exceed 2^oC

whole zone

Suspended solids

waste discharge not to raise the natural ambient level by 30%, nor cause the accumulation of suspended solids which may adversely affect aquatic communities

marine waters

Chemical Oxygen Demand

not to exceed 30 mg/L

inland waters of the WCZ

Aesthetic Appearance

(a) discharge should not cause objectionable odour or discoloration

(b) no tarry residue, floating wood, articles made of grass, plastic, rubber or any other substance

(c) Mineral oil not visible on the surface. Surfactants should not give rise to a lasting foam.

(d) no recognizable sewage-derived debris

(e) no floating, submerged or semi-submerged subjects likely to interfere with the free movement or damage of material

(f) not to contain substances which settle to form objectionable deposits

whole zone

whole zone

whole zone

whole zone

whole zone

whole zone

Nutrients

not to be present in quantities that cause excessive growth of  algae or other aquatic plants

annual mean depth average inorganic nitrogen not to exceed 0.1 mg/L

marine waters

marine waters

5-Day Biochemical Oxygen Demand

not to exceed 5 mg/L

inland waters of the WCZ

Unionized Ammonia

annual level should not exceed 0.021 mg/L

whole zone

Dangerous Substances

not to be present at levels producing significant toxic effect in humans, fish or any other aquatic organisms, with due regard to biologically cumulative effects in food chains and to toxicant interactions with each other

not to cause a risk to any beneficial use of the aquatic environment

whole zone

whole zone